Features of structure and property of alloys on the basis of Ni3Al intermetallic compound, half-scientists method SLM

Evgenov A.G., Bazyleva O.A., Golovlev N.A., Zaysev D.V.
UDC
669.017.165
DOI
10.18577/2307-6046-2018-0-12-25-36
Article PDF (Russian) (1.41 MB)
How to cite
Evgenov A.G., Bazyleva O.A., Golovlev N.A., Zaysev D.V. Features of structure and property of alloys on the basis of Ni3Al intermetallic compound, half-scientists method SLM // Proceedings of VIAM. 2018. No. 12. DOI: 10.18577/2307-6046-2018-0-12-25-36. URL: https://test.viam.ru/en/journal/2018/12/3
Keywords
selective laser melting, crystallization rapidity, carbides, morphology, HIP, dendrite axes, cells.
Abstract

This paper is a work of investigating the structural features of VKNA-type Ni3Al-based alloys, made by selective laser melting (SLM) in several conditions: directly after synthesis, thermal and gas-static treated. The main features grain structure formation are shown depending on the content of carbon in the alloys. In previous scientific research it was established that crystallization for VIN5 and VKNA-1VR alloys obey the normal crystallization law. Right after the melting, matrix for VIN5 and VKNA-1VR is a g-solid solute, and dispersed pieces of the γ′-phase are uniformly distributed in the grain volume. Type VKNA25 (VKNA 25R) alloy has another crystallization mechanism: the distribution of  alloying elements changes. γ′-phase is now the matrix after synthesis.

The carbon influence and the amount of carbides on the recrystallization process and the formation of grains in the synthesized metal in the process of HIP are considered. It is shown that VKNA25 ( HIP) has practically equi-axed grain formation. Some grains contain twins, as the cause of the formation of which can be both the recrystallization process and micro strain in the process of comprehensive compression at the HIP. VKNA25 (R) has the preferred orientation of the elongated grains in the [001] direction. VIN5 and VKNA25 alloys after the HIP have the γ′-phase particles with a predominantly cubic morphology. VKNA25 (R) has irregular shapes of the γ′-phase parts.

The properties of the short-term strength of intermetallic alloys are determined in comparison with each other in different conditions (even casted). The values of the long-term strength of the synthesized materials right after melting and subsequent HIP are determined. It is shown that the long-term st

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